Hide Notification Bar

How to hide status bar in android in just one activity

If you want to remove status bar then use this before setContentView(layout) in onCreateView method

    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
    WindowManager.LayoutParams.FLAG_FULLSCREEN);

credits

Hide Notification bar

You could use a theme in your AndroidManifest.xml:

android:theme="@android:style/Theme.NoTitleBar.Fullscreen"

or change parent of your AppTheme to @android:style/Theme.NoTitleBar.Fullscreen like this

<style name="AppTheme" parent="Theme.NoTitleBar.Fullscreen">
</style>

then apply this theme on activities which you want Fullscreen like

android:theme="@style/AppTheme"

or use the following code snippet:

public class FullScreen
    extends android.app.Activity
{
    @Override
    public void onCreate(android.os.Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                                WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.main);
    }
}

How to hide Android StatusBar in Flutter

SystemChrome.setEnabledSystemUIOverlays([]) should do what you want.

You can bring it back with SystemChrome.setEnabledSystemUIOverlays(SystemUiOverlay.values).

Import it using

import 'package:flutter/services.dart';

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Update answer (from Flutter 2.5 or latest):

SystemChrome.setEnabledSystemUIMode(SystemUiMode.leanBack);

Or you can use another options like:

SystemChrome.setEnabledSystemUIMode(SystemUiMode.manual, overlays: [
  SystemUiOverlay.bottom
]);  // to hide only bottom bar

Then when you need to re-show it (like when dispose) use this:

  @override
  void dispose() {
    super.dispose();

    SystemChrome.setEnabledSystemUIMode(SystemUiMode.manual, overlays: SystemUiOverlay.values);  // to re-show bars

  }

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